Abstract

We present what we believe to be the first true three-level laser based on a Nd-doped crystal. From the ${}^{4}F_{3∕2}–{}^{4}I_{9∕2}$ laser transition, the lower laser level being the ground state, emission at $879\mathrm{nm}$ in ${\mathrm{NdGdVO}}_4$ has been obtained with diode pumping. Up to $0.8\mathrm{W}$ of power has been achieved in cw operation and $24\mathrm{\mu }\mathrm{J}$ per pulse $\left(35\mathrm{ns}\right)$ in the Q-switched regime. Intracavity second-harmonic generation in the pulsed regime is also demonstrated with $178\mathrm{mW}$ of average output power at $439.5\mathrm{nm}$, corresponding to an energy of $17\mathrm{\mu }\mathrm{J}$ per pulse.

© 2006 Optical Society of America

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